Introduction to Kotlin

Presented on March 24 , 2018 at F22 Labs, Chennai

Transcript

1. INTRODUCTION TO KOTLIN
2. • Kotlin’s development is from a team of JetBrains programmers based in Saint Petersburg, Russia. • Offers IDE for Java, Ruby, Python, PHP, SQL, Objective-C, C++, C# and JavaScript. • Flagship IDE IntelliJ IDEA . Android Studio built on IntelliJ IDEA . • In July 2011 JetBrains unveiled Project Kotlin • The name comes from Kotlin Island, near St. Petersburg. • At Google I/O 2017, Google announced first-class support for Kotlin on Android. • Kotlin v1.2 was released on November 28, 2017
3. ➔ Concise ➔ Pragmatic ➔ Safe ➔ Interoperable ➔ Object Oriented and Functional
4. • Kotlin is fully compatible with JDK 6 . • Kotlin tooling is supported in Android Studio. • Compact runtime library. < 100K to size of APK. • Kotlin application runs as fast as equivalent Java one. • Getting started with Kotlin is very easy for a Java developer
5. Basic Syntax
6. Kotlin s fun
7. Mutable Variable Immutable Variable
8. data Class Compiler derives following members ➔ equals() ➔ hashCode() ➔ toString() - like “Person(name=Aravindraj, age=25)” ➔ componentN() functions ➔ copy()
9. copy() UseCase Auto Generated
10. Destructuring Declarations - componentN()
11. Powerful when In above snippet case 3 is repeated twice . when matches its argument against all branches sequentially until some branch condition is satisfied. Once matching argument is found sequence terminates . Hence output will be Auto
14. In the code snippent to left , first two cases evaluates to true . But since when is sequential output will be Warm
15. Null Safety Kotlin type system distinguishes between references that can hold null and those that cannot
16. Nullable Type Non-Nullable Type
17. Safe Calls ?. !! Operator
18. Extension Function
19. Thank You Aravindraj Palani @aravindrajhere Aravindraj Palani